ISO 14692-3:2002 pdf download

ISO 14692-3:2002 pdf download.Petroleum and natural gas industries 一Glass-reinforced plastics (GRP) piping-Part 3: System design.
If space is limited, consideration should be given to designing the system to optimize the attributes of both
GRP and metal components.
5.3 System supports
5.3.1 General
GRP piping systems can be supported using the same principles as those for metallic piping systems. However, due to the proprietary nature of piping systems, standard-size supports will not necessarily match the pipe outside diameters. The use of saddles and elastomenc pads may allow the use of standard-size supports.
The following requirements and recommendations apply to the use of system supports.
a) Supports shall be spaced to avoid sag (excessive displacement over time) andlor excessive vibration for the design life of the piping system.
b) In all cases, support design should be in accordance with the manufacturer’s guidelines.
C) Where there are long runs, it is possible to use the low modulus of the material to accommodate axial expansion and eliminate the need for expansion joints, provided the system is well anchored and guided.
d) Valves or other heavy attached equipment shall be independently supported.
NOTE Valves are often equipped with heavy control mechanisms located far from the pipe centreline and can cause large bending and torsional loads.
e) GRP pipe shall not be used to support other piping, unless agreed with the principal.
f) GRP piping should be adequately supported to ensure that the attachment of hoses at locations such as utility or loading stations does not result in the pipe being pulled in a manner that could overstress the material.
g) Consideration shall be given to the possible design requirements of the support to provide electrical earthing in accordance with the requirements of 5.8 and clause 10.
Pipe supports can be categorized into those that permit movement and those that anchor the pipe.
5.3.2 PIpe-support contact surface
5.3.2.1 GuIdelines
The following guidelines to GRP piping support should be followed.
a) Supports In all cases should have sufficient width to support the piping without causing damage and should be lined with an_elastomer or other suitable soft material. The minimum saddle width, in millimetres, should be J3OD , where D is the mean diameter of the pipe, in millimetres.
b) Clamping forces, where applied, should be such that crushing of the pëpe does not occur. Local crushmg can result from a poor fit and all-round crushing can result from over-tightening.
C) Supports should be preferably located on plain-pipe sections rather than at fittings or joints.
d) Consideration shall be given to the support conditions of fire-protected GRP piping. Supports placed on the outside of fire protection could result in loads Irregularly transmitted through the coating, which could result in shear/crushing damage and consequent loss of support Integrity.
5.3.2.2 Supports permitting pipe movement
Pipe resting in fixed supports that permit pipe movement shall have abrasion protection in the form of saddles,
elastomenc materials or sheet metal.
5.3.2.3 Supports anchoring pipe
The anchor support shall be capable of transferring the required axial loads to the pipe without causing overstress of the GRP pipe matenal. Anchor clamps are recommended to be placed between two double 180 saddles, adhesive-bonded to the outer surface of the pipe. The manufacturer’s standard saddles are recommended and shall be bonded using standard procedures.
5.3.3 Support and guide spacing
The spanning capability of GRP piping spans is generally less than that for steel pipe, due to the lower modulus of the material. Supports shall be spaced to avoid sag (excessive displacement over time) and/or excessive vibration for the design life of the piping system.
GRP pipes, when filled with water, should be capable of spanning at least the distances specified In Table 1 while meeting the deflection criterion of 0,5 % of span or 12,5 mm centre, whichever is smaller. Spans are assumed to be simply supported. In some cases, bending stresses or support contact stresses may become a limiting factor (see 8.6), and the support spacing may have to be reduced.